Indoor lighting unit



April 2, 1935. A, J SWEET INDOOR LIGHTING UNIT Filed Aug. 26, 1952 4 Sheets-Sheet 1 AJIEh EET M ATTORNEY April 2, 1935. A. J. SWEET INDOOR LIGHTING UNIT Filed Aug. 26, 1932 4 Sheets-Sheet 2 INVENTOR l {24 iq ATTORNEY A ril 2,1935. A. J. SWEET 1,996,597

INDOOR LIGHTING UNIT I Filed Aug. 26, 1952 4 SheetsSheet 3 INVENTOR ,4. I SW55 T ATTORNEY I A ril 2, 1935. A. J. SWEET 1,995,597

INDOOR LIGHTING UNIT Filed Aug. 26, 1952 4 Sheets-Sheet 4 M A 24 Q I I .73 /5 WW l MA 2 L /3 U I H1 5 A 1 ATTORNEY Patented Apr. 2, 1935 UN [TED STATES INDOOR LIGHTING UNIT I Arthur I; Sweet, WestCaldw-ell; N. J.,iassignor. to-

WestinghousehampCompany, a corporation of Pennsylvania Application August 26, 1932, Serial No. 630,503 9 Claims. (01. 240-9) invention relates toartificial lighting and this type of lighting save for installations where relates more particularly to lighting fixtures or the spectacular andadvertising advantages justiequipmentadapted-to being built into aninterior fiedtheitimeand labor involved, of a building so as to. constitute a luminousarchiobject of my invention is to provide a standtectural element rather than an element assoard factory-built product of substantially perfect 5 ciated purely with a. lighting functionand having f i y W se ass b y s D T no architectural significance divorced from that n n-subje t t variati ns'int d ed y' h in' function. An importantfeature-o-f my invention vidualworkman that these practicaldifiiculties lies in. providing a, plurality: of. t dard, parts are avoided. and this useful type of lighting is m which can, be variously. bl d. totpmduge thereby free from the practical limitationswhi'ch great diversityof architectur -Land decorative hav p v nt it app a i t the pu i d. efiects smultaneously, t fit interior of Another object of the present inventi'on,.,is t'o whatever dimensions asan: architectural element p v a ed element. o Wa 'Or ceil n ade of such. interior, up from a plurality of standard par-ts, allindi-f Inmany typesof. interior,- the pleasing charviduals 0f eachi style ofsuch parts being 0f actor-of the. interior, as likewiseits practical util- Substantially identical flimensions} fi Darts ity wguld beenhancedjf ljghigingfixtures t being of such character that they can be, easily heretofore conventional, type. could be eliminated d pe yassembled p u y f a and the lighting service derived from lumi us wide diversity of architectural designs and to fit elements-of the wallsr or ceiling, Such: treatment a y of a Wide diversity of inferior p p rt s 20 especially lendsaitself to-the employment of. reland dimensions; n in combination with such atively large light sources of low'brilliancy, thus glazed element, light sources Of a character to promoting hyg 'eniccenditions forvision-L I-t likebe conveniently. d inexpensively mo ted n wise lends itself to: more exact control i th such spacial, relationship to; the glazed; element 25, intensity of illumination. and inthe directi as to produce a correct relationship in light disfrom-which the light is received on the work at triblltionl v, eachiandallipositions'in the room. The artificial Another Objectv Of y invention is to p v skylight i th b t-k 50m i hi h thi a glazed element which in general provides a general type.- of lighting, has been employed! in se is on of light but which, by the subtherpasts stit'ution of prismatic or lens glassware for. the 30 Thepubli'crhas heretofore been prevented from diffusing glassware at Substantially a y point enjpying th th ti hygienic d. utilitarian in theelem ent, can bemade to. provide a paraladvantages: of the: skylight type of lighting by lel or nearly parallel beam of. light directed.v to- Certain practical; difiicultie5- i securing; n ward thework or object of vision from. the defactory'installation, Inaccordan'cewithitheprese S I ifm- I a 5 t i ention, a lighting system having aluminous Anotherv obj ectof, my invention is to'pro'vide a. elementas awall or'ceiling-is made up or alarge .glazedvelement W o Ce ng whose aSS number of pieces whichmaybe alike'fcr appearp rts, While securelypported against acciance; efiects, for convenient access to the lamps, dental-i Challce displacement, are easily v 40 fonccnvenientcleaning:and'to-avoid dangerously ,able- 34 light Source 0r fer Cleans 40 large-'glasselementsi 'Ihese-separate-piecesmay s typically comprise an orderly arrangement and These and other objects and advantages of the repetition ofiasfew Standard-. shapes andisizes, 11-, invention will be more clearly understood from is of advantage, for practical reasons; that each W d r p o the with the ac.-

of these like parts shall: be: sufi'iciently closerin 0 D y mWi n i 45 dimensionsto be interchangeable, Where; as-in a a m ntary V ew of a gla'zedarchipastipracticeg the mechanical elements which-iseps ctural-element and its ass at d} light S01E08 t t glass, walls have been especially built constructed, inaccordance withthe present. in.- for; a; particular in t ll ti great. difii'culty h ventiomthestructure shown consisting ofaiglazed been experienced in maintaining; dimensions to coveinstalledalong he i 'b ween wall 50 suclr exactness asto make similar parts interd C i g, This view W V in pp left changeable. Moreover; the assembly of each sepc e e p ef r Of mounting, the g t 'arate -installation as an individual thinghasinsource employedforproviding, the difiused-genvolviediemzessive cost. For these practical reason's, eral light emissionand, in a plane nearer the thearchitectcr designcrhas been loth toemplo-y beholder, the preferred way of; mounting the 55 light source employed for providing a beam of light specifically directed toward some object of vision.

Fig. 2 is a view taken on line IIII of Fig. I;

Fig. 3 is an assembly of the skeletal element of one side of the room, duly assembled and laid out in position to be cut for fitting at the corners of the room;

Fig. 4 is a front and a sectional view of one of the small-size rectangular frames for holding the light transmitting plates;

Fig. 5 is a front and sectional view of an oblong frame for holding a light-diffusing plate;

Fig. 6 is similar to Fig. 4; but showsa larger size rectangular frame;

Fig. 7 is similar to Fig. 5 but shows a larger size oblong shaped frame;

Fig. 8 is a front and cross-sectional view of the large size rectangular frame;

Fig. 9 is a front View and two edge views of a triangular shaped frame. a

It will, of course, be understood that the shapes of Figs. 4 to 9 inclusive are only illustrative of the almost infinite variety of shapes and sizes which might be employed under my invention.

In the preferred form of my invention, at least one dimension of each style of frame will correspond with a dimension of a different style of frame, to facilitate their fitment together.

Fig. 10 is a fragmentary perspective view of a portion of the corner joint support; v

Fig. 11 is a fragmentary perspective view showing portions ofthe flanges of two frames, secured together;

Fig. 12 is a sectional and end view of a rivet, the preferred means for joining two frames so as to form a part of a single assembly;

Fig. 13 is a fragmentary perspective view showing a wedge piece in positionbetween the flanges of two frames to hold them in riveted angular relation;

Fig. 14 is a perspective view of the Wedgeshaped piece employed to separate the frames;

Fig. 15 is a. detailed, enlarged view, partly in section, showing the preferred way of 'mounting the light source employed for providing the diffused general light emission and, in a plane nearer to the beholder, the preferred way of mounting the light source employed for providing a beam of light specifically directed toward some object of vision; v Fig. 16 is a detailed view ofa portion of the preferred construction for supporting the light source designed to give parallel, directed beam;

Fig. 17 is a perspective view of an assembly unit applied to the interior of a room; and

Fig. 18 is a fragmentary perspective view showing a frame and a companion frame or retainer member for holding a glass fiat in position when it is desirable to hold the light transmitting element in a vertical position.

In providing a lighting element of the present character it would ordinarily be necessary to build a unit to fit the particular room in which it is to be installed. Under this condition, con- 7 siderable expense would be involved, since each structure. would necessarily have to be made special in thefactory after the necessary measurements had been taken. The labor cost would, therefore, be high and a great deal of trouble and time would be consumed. A structure could, of course, be produced in this manner; but 'the present invention goes further than that and. provides a structure which may be'built up of a number of conveniently connectable and interchangeable elements. These elements may be assembled into a complete skeleton frame, for one side of a room and these elements may be easily and quickly united and then trimmed to fit a similar skeleton frame for the adjacent side.

By reason of the selection of the component parts or skeleton units which compose the frame, it is possible, in accordance with the present invention, to lay out and unite the various elements into complete sections and cut or trim the sections to meet the conditions of the particular job. The simplicity of assembly and the flexibility of the present structure to meet varying conditions is shown in the accompanying drawings in which the walls ill and ceiling l l of a room l2 are shown. Attached to the wall and ceiling and supported by molding pieces l3 and I4 is a frame or platesupporting structure l5. This structure is comprised of individual frames IE, IT, I8, I9, 20 and 2i shown in Figs. 4 to 9. Each of the frames is formed with a plate supporting flange 22 and side or connector flanges 23. The connector flanges are provided with perforations 24 to receive rivets or eyelets 25 as shown-in Fig. 12.

When assembling the structurecomposed of the numerous frames, the frames may be positioned in lay-out form as shown in Fig. 3 with the different sized plates arranged to give a pleasing selected design in the form of a wall, the walls being connected by an angle or junction piece 25'. If the frame is to be used as a flat or horizontal ceiling fixture, the various component parts may be laid out in accordance with the general shape of theroom and may be readily cut to the exact shape by trimming. In the present embodiment ofthe inventiomhowever, the structure is shown as applied to what may be termed cove lighting wherein the fixture is disposed to give a dome shape to the room and is of an aren ate form in transverse cross section having one edge adjacent to-the ceiling and one edge adjacent to the wall of the room leaving a space or compartment 25" between the frame and the corner to receive lighting units which may be in the form of incandescent electric lamps 26 or 21.

As shown in Fig. 3, when a side orsection of frames have been assembled they may be trimmed as indicated in dotted lines 28 to provide for joining with another section at 28 as shown'in Fig. 17.

For the purpose of obtaining the necessary cur vature of the frame to provide for the cove type of structure. wedge shaped members 31 are provided and, as shown in Fig. 13, these wedge shaped members are disposed between the connector flanges 23 of adjacent frames which, when secured by rivets 25, are held in the desired angular relation so that each frame is tilted slightly to complete the curved formation;

When asembling the structure, the flanges 22 face outwardly disposing the connector flanges 23 in the rear thus leaving each individual flange in position to receive a light diifusing plate 32. Inasmuch as the frames are disposed-at an angle to the vertical, the plates will remain in position' without means other than their weight against the frame. If desirable, however, they may be held in bysuitable clips. In practice it has beenfound that the weight of the plates and the position of the frame serve to hold the plates in the proper positions for all practical purposes. The plates, therefore, are readily removable and one plate may be substituted for another at will.

As illustrated in Fig. 17 of the drawingsthe light-giving elements are shown positioned behind the plates in the row indicated by the referenee': numeral t33s For this. purpose. sockets: 34 maybesecuredito-a bracket or wire duct 35 rigid:- ly attached to. the wall and: ceilingv and so positioned: as: to support: the sockets with. their longitudinal axesisubstantially vertical-1 to. thepl'ane of the now 33 of plates. Each. socket is provided with a reflector 36- which in conjunction with thetenclosed surfaces; of thewall and: ceiling acts to. reflect light. The surfaces of the, wall and ceiling: may,.if desirable, be provided: with reflectlayers. or plates l0. and bt" to. provide amore efiectiye. reflective. mediun'r. .Each socket is pro Vided with; threads: 3371 to receizve clamp. nuts 38 aml13z5 between which. the reflector 3.8 may be secured. The. elements 21- maybe employed to direct light through the plates which. may be of. the ordinary diffracting or light-disbursing crystal glass. as. hereinafter more: fully set forth onmaybe of opal or other diffusing translucent class When it. is desirable, however, to direct a concentrated beam. of light onto a given portion of the: room, one. of. the platesma c be removed and aprismatic lens substituted. When using such a lens. it. is desirable to adjust the light source in proper relation to the lens to produce a beam of light properly directed. For this purpose a u shaped strap. or bracket arm 41 is provided having. foot. piece; 42 provided with an. aperture to reserve} the threaded portion 3 of the base. The; foot, piece may be locked in position by the clamping nuts 33 and 33.. Integral with'the foot piece 42ris;an.extension-3 bent at rightangles to provide; a lamp carrier arm Mi having a slot 45. The. arm M; is provided witha' socket 46 disposed in the slot: 45. and. movable therealong. This socket is provided with the usual internal screw shell 4d: and is. so disposed that the shell extends through the slot:- to-bring a shoulder 48 on the body-of the; socket in contact with the arm- 44.

Aclamp. ring 49 is'provid'edof suitable insulativematerial. and internally threaded to be screwed; over the shell and pressthe'arm- 44 between the.- ring and; the shoulder 48 thus holding the socket. in. a given position. A swivel joint is provided; andiv the. socket may readily be adjusted to any position along thearm 44- by l'QQseningthe-ring-AQ and" may be clamped in positionby: tightening the. ring. Bythis constructiona: bulblfimaybe secured in. such relation to a. prismatic: lens 51 as to direct a concentrated beam of. light ona table, desk or other portion-of theroom=..

When it is desirable to. practice the present invention to provide a unit having the light-transmitting wall in a substantially vertical plane frames 5'5 as shown Fig. 18 may beemployed. Theseframesmay be generally the-samea-s shown in Figs. 4 to 7 but may be provided witha retainer member or rim- 55 which snugly fits the inner surface of' the flange of' the frame. Thus whena glass plate 51' is in place the rim 56 may be forced into position, locking the plate in the frame. The. retainer frames may be. provided with depressions 58 to receive the heads of. rivets 59 so that the. retainer members 56 willbe. moresecurely'retained.

Byreasonaofthepresentinvention a simple and inexpensive structure: is; provided since the. varieous. component parts may. be. machine-made. in quantity: cheapening the cost and at: the same timethe method of fabrication-provides the-necessa-ry strength and affords a construction which conforms-to the requirements of thelawsgoverning: the installation; and use: of; structuresof; this character; J

In. the. practical application: ofi myrinventionz to problems. of lighting servilzethe. architectorothen designer; will designfthat. element: of the. interior which. is to; be made luminouaemploying: imhis design the shapes and dimensionsiof'thestandard factory-made partssuch. as frames: k5,. 1215. I8: and I9 which are typically illustrated in: Figs/l: to29 inclusive; The. vast. variety 016 designs in; which these). parts can becombined afiordsla bnoadifreee dom to; they designer with respect to.= aesthetic effects. The use of uniform, machine-madep'arts guarantees. to the designer: the. execution of. the design without closev attention, on; the. designers part, atrelatiively low. cost;.w.ithcut vexatious; de. fects. arising from: non-uniformity inv workman: ship;

Inerection,.the contractor secures the requisite quantity of the variouspiece parts fromr the tactoryor from a local. jobber or dealer. lwithisettingv punch: and softexpanding rivets. 2.5, utilizing the: factory-made rivet. holes 24?, the. contractor assemblesthe standard parts inacc'ordance with the design. Atzpointsof juncturetypicallyillustrated byv the cornersofcthe room .inFi-gs; 2-.and 17f,

the contractor cuts theassembly toifit thea'djoiningl assembly, joining the two. assemblies. by'a suitable. junction piece 25!. For typ'esrot juncttionoften met with in practice, standard factorymade' junction pieces will. beprovided; in other cases, junction pieces will be fabricated onor especially-for the job.

Where approximations: to curved surfaces or changes in slope are required; the wedgeeshaped pieces3ll shown in Fig. IA; are inserted between two. adjacent frames, asshownin-Eiglii'. Such wedgeeshaped. pieces: may be furnishemiactory made in a variety-.ofangl'es. The-construction here shown afiords a rigid and permanent attachment and involvesjgreat convenience off-as semblyandlow cost;

Except for that special case where the plane of" the glazed architectural element is verticalor nearlyso, the gl'assis preferably held'in the-frame merely by gravity. More. significantly: expressed, the frame is made of such a shape as-"to-provide a securesupport of theglassiwith gravity as the only holding element. This feature permits; of very. convenient removal of' the glassfor cleaning or for accessto thelamps-or electrical wiring. It is a feature materiallypromoting the practical utility of the invention,

Where the glazed architectural element occupiesa plane vertical or nearly so, the invention includes the. use of thecompanion frame or retainer; member 5 5 snugly: fitting within the standard' frame 55 in the same-manner'as the common can of commerce fitsintoitscovera Since-both are machine made, it-ispractical to-provide a snug: fit. This method of support, shown in Fig. l8, provides a secure supportiyet one easilyre moved for cleaning, or-f'or access to lamps or wiring;

In the simplest form of the.- invention; the

glazed elements will be simple pieces of glass of proper character, cut to fitthe-respective' frames.

It is possible, however; to. provide leaded-glass assemblies, enlarging the aesthetic: possibilities of thedesign by contrastingthe narrower metal band of the leading with the wider metal band of the frames, or by more elaborate designs worked out in contrasting colors or'by both-z I It i's-alsopossible to provide two; similar pieces of'glass, preferablydlifracting g-lass (.pattern; or-

surface-roughed crystal glass), and to .assemble these face to face with a design in colored celluloid or colored paper betweenthem. This affords an' inexpensive means of providing decorative effects which can conveniently and inexpensively be altered from time to time. The two pieces of glass and the sandwiched color design will usually be assembled into a single unit by a binding around the periphery. r r

. As will be .obvious, the tone of the illumination to be provided can be controlled by selection of glass or other light-transmitting material of the proper color. The most general application of this feature will be in installations where it is-desired to provide artificial illumination of daylightcolor value, in which situation blue glass of, theproper characteristics will provide such selective absorption as will transform the yellow light of. the ordinaryincandescent lamp to the white light of ordinary daylight.

By intelligent selection of the architectural elements which are to be made light-emitting, the character of the illumination can becontrolled, to the end of attaining desirable utilitarian or hygienic or aesthetic effects. Thus, if the invention-be employed to provide a luminous ceiling or parts of ceiling, the resultant illumination will be much stronger on horizontal surfaces than on verticalsurfaces. If, on the other hand, the invention be applied to the construction of luminous pilasters or wall surfaces, vertical objects in the room, in planes facing such wall surfaces, will be much more brightly illuminated than horizontal objects or objects turned away from the luminous wall surface.

Still again, where it is desired to illuminate all surfaces in the room, whether vertical or horizontal, to approximately the same intensity, a luminous cove, such as illustrated in Figs. 1 and 1'7, will produce the desired result. The invention, therefore, provides great latitude of design with respect to the illumination results to be produced.

g In many classes of lighting service, it is desirable to provide a general uniform illumination with superimposed brighter lighting of the correct directional value on certain objects in the room. Thus, for example, in ordinary office lighting it-is desirable to provide general uniform illumination on vertical and horizontal surfaces with superimposed brighter illumination on the desk, this latter being delivered over the left shoulder of the desk user so that the shadows and any specular reflections will be thrown away from the users eyes. The invention is adapted to this requirement bysubstituting anelement of lens glass for an element of the diffusing glass chiefly used, selecting such location as will enable the beam to come fromthecorrect direction. In order to produce a substantially parallel beam, the light center must be at the designed focal distance, D of Fig. l, behind the lens. If the light center is at the focus,-that is, directly behind the optical center of the lens and at the focal distance,-the parallel beam of light will be emitted perpendicular to the surface of the lens. If, however, the focal distance be maintained but the light center be moved laterally away from the focus, the beam will be emitted at a corresponding angular divergence from the perpendicular tothe lens. I

It is possible, therefore, by such lateral displacement of the light center to vary the directionof the beam so as to produce the exact results desire d. .It would,,of course, be possible to produce the same results by varying the design of .the lens. This invention, however, permits a standard form of lens to be used, and the substantially-identical results tobe accomplished by lateral displacement of the light center, to the increased practicality and utility of the device.

The preferred means for producing the results described in the preceding paragraph are shown in the upper left hand corner of Fig 1. Here the U-shaped strap 4| is employed for supporting the electrical receptacle and its lamp; This U-shaped strap isattached to the wiring duct or to the building construction by a swivel joint which can be clamped in any desired position. The electrical receptacle is clamped to one arm of the U by such means as permit it to be ad'- justed at any position along this arm which may be desired. By adjusting the receptacle in such position of the arm of the U as willbring the filament center at the desired lateral displacement from the focus ofthe lens and by rotating the entire U. on the swivel by which it is supported and clamping it when the proper position of rotation is reached, the light beam rom the lens may be thrown in exactly the desired direction; If desired for greater efficiency, a hemispherical reflector may be usedas an auxiliary to the light source; or, if the glass element be prismatic glass of other than lens form, the reflector employed may be of such design as shall. properly coordinate with the optical characteristics of the glassplate.

The-light source or sources used in conjunction with lens or prismatic plates to produce approximately parallel light beams may be wired on separate control from the light sources employed for the general, diffused lighting. it is then possible to provide only the general diffused lighting, r only the parallel light beams or the combination of the two. A feature of the invention, including means for conveniently varying the light distribution without change in the architecturaleffects other than in the luminosity of certain architectural elements, and without other effort than the mere snapping of a wall switch, is of very considerable practical importance. 7

It will be obvious that if for any reason, such as'rearrangement of objects in the room, it be desired to change the location of the object upon which the parallel beam is delivered, the invention provides a means by which this canbe inexpensively, conveniently and quickly accomplished. It is necessary only to remove one of the lamps employed for diffuse lighting, attach the U-support to the respective lamp receptacle which then becomes a means for swivel attachment, interchange the wiring connections and interchange the lens and diffusing glass plates. In other words, the complete equipment at the parallel beam outlet is interchanged for the equipment at some other outlet heretofore used for the diffused lighting By such simple change the character of light distribution may be adapted to substantially any conceivable lighting requirement of an interior. i

It will be obvious that light sources of a wide diversity of character may be employed. For

instance, light sources in which the element of luminosity is an incandescent gas ratherthan incandescent solid, such as the mercury vapor lamp or the neon lamp, may be employed. Such light sources, if of satisfactory color value, are perfectly adapted to. diffused lighting under this invention, though they are not so well adapted as the incandescent lamp to the parallel beam lighting.

It will be equally obvious that this invention is adapted to the inclusion of health radiations as Well as visible radiations. For instance, the light source employed may be a source emitting radiation in the so-called vital ray band, radiation of wave length between 289 milli-microns and 313 milli-microns. By employing a glass which transmits radiation of this character, the provision for health-giving rays in conjunction with visible light, while yet attaining a highly satisfactory architectural effect, is entirely practical and convenient.

The versatility of the invention with respect to the attainment of the widest diversity of light effects in conjunction with the widest diversity of architectural effects is a most impressive and important feature. It is true that a similar diversity is theoretically obtainable by special construction of similar design built for a specific installation, but the impracticality of such constructions, due alike to cost considerations and to the impracticality of sufficient uniformity in the fabrication of the parts, has debarred the public from securing the advantages of this type of lighting. By providing a construction which removes these practical barriers, a most useful form of lighting is made practical for general use.

What is claimed is:

1. A lighting fixture comprising a plurality of holders for light-transmitting plates each of said holders comprising a frame having a ledge to receive a plate and a surrounding flange, said holders being arranged with their flanges adjacent to constitute a lighttransmitting partition, means for connecting the flanges of adjacent holders, means for securing said partition in spaced relation to the wall of a room, a light source disposed between said partition and said wall to provide diffused illumination for said room, said plates being removable to permit the substitution of a plate capable of projecting a concentrated beam of light to a predetermined portion of said room.

2. A light unit comprised of a plurality of holders for light-transmitting plates, said holders being of definite imensions and varying in shape, each of said holders having a perforated peripheral flange, said perforations being positioned to align the perforations of adjacent flanges when said holders are disposed edge to edge to provide a partition and means disposed in said aligned perforations to secure said holders in rigid relation.

3. In combination with a room, an overhead lighting structure comprising light-transmitting plates, holders for said plates, each of said holders having a ledge to receive a plate and a surrounding flange, said holders being arranged with their flanges adjacent, means between said flanges for holding said plates in angular relation to provide a substantially arcuate shaped partition and means for securing one edge of said partition to the wall of said room and the other edge to the ceiling of said room.

4. In combination with a room, an overhead lighting structure comprising light-transmitting plates, means for holding said plates with their edges adjacent, wedge-shaped members between said edges for holding said plates in angular relation to provide a substantially arcuate shaped partition, means for securing one edge of said partition to the wall of said room and the other edge to the ceiling of said room, and means for supporting a light source in the space between said partition and the wall of said room.

5. In combination with a room, a fabricated portion comprising a multiplicity of holders for light transmitting plates each of saidholders consisting of a frame having a ledge to receive a plate and a surrounding flange, said holders being arranged with their flanges adjacent to provide a plate retainer wall, means for connecting the flanges of adjacent holders, and means for securing said wall diagonally between the ceiling and wall of the room whereby a compartment is provided in the upper corner of the room to house a light source.

6.- In combination with a room, a fabricated portion comprising a multiplicity of holders for light-transmitting plates each of said holders consisting of a frame having aledge to receive a plate and surrounding flange, said holders being arranged with their flanges adjacent to provide a plate retainer wall, means for connecting the flanges of adjacent holders, means for securing said wall diagonally between the ceiling and wall of the room whereby a compartment is provided in the upper corner of the room to house a light source and means in said compartment for supporting lamps behind selected plates of said wall abutting edges connected.

7. A lighting partition comprising a partition arranged to bridge the corner of a room between a wall and the ceiling consisting of a plurality of holders for light-transmitting plates said holders having projecting portions, means for securing said portions together with the holders in edge abutting angular relation to constitute an arcuate light-transmitting partition and means for securing one edge of the partition to a wall and an opposite edge to the ceiling of a room.

8. A lighting partition comprising a partition arranged to bridge the corner of a room between a wall and the ceiling consisting of a plurality of holders for light-transmitting plates said holders having projecting portions, means for securing said portions together with the holders in edge abutting angular relation to constitute an arcuate light-transmitting partition and means for securing one edge of the partition to a wall,

an opposite edge to the ceiling of a room and a plurality of light-giving elements arranged between said partition and the wall of said room.

9. A lighting fixture comprising a partition extending from a wall of a room inwardly and toward the ceiling, said partition consisting of a multiplicity of frames for light-transmitting plates said frames having flanges at their abutting edges by means of which they are united.

ARTHUR J. SWEET. 

